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arXiv 0812.5036physics.ins-dethep-ex
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CMS中的轨道重建性能

Track Reconstruction Performance in CMS

Paolo Azzurri

摘要:

给出了利用CMS硅跟踪器进行LHC事件径迹重建的预期性能。径迹发现和拟合是用卡尔曼滤波技术完成的,在pT>1 GeV/c的单个μ子上实现了99%以上的效率。困难出现在具有高密度带电粒子的标准LHC事件的上下文中,其中对于低pT轨道,假组合轨道的比率非常大,并且跟踪器材料中的核相互作用降低了带电强子的跟踪效率。最近对CMS轨道重建的改进现在允许通过结合迭代跟踪过程利用假轨道的最佳拒绝来有效地重建具有低至几百MeV/c的pT和少至三个交叉层的带电轨道,具有非常小的假分数。

英文摘要:

The expected performance of track reconstruction with LHC events using the CMS silicon tracker is presented. Track finding and fitting is accomplished with Kalman Filter techniques that achieve efficiencies above 99% on single muons with pT>1 GeV/c. Difficulties arise in the context of standard LHC events with a high density of charged particles, where the rate of fake combinatorial tracks is very large for low pT tracks, and nuclear interactions in the tracker material reduce the tracking efficiency for charged hadrons. Recent improvements with the CMS track reconstruction now allow to efficiently reconstruct charged tracks with pT down to few hundred MeV/c and as few as three crossed layers, with a very small fake fraction, by making use of an optimal rejection of fake tracks in conjunction with an iterative tracking procedure.

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